//
//  UIDevice.swift
//  Blockchain
//
//  Created by Maurice A. on 4/16/18.
//  Copyright © 2018 Blockchain Luxembourg S.A. All rights reserved.
//

import Foundation
import UIKit

extension UIDevice {
    
    public var type: DeviceType {
        switch UIDevice.current.userInterfaceIdiom {
        case .tv,
             .pad,
             .carPlay,
             .unspecified:
            return .unsupported
        case .phone:
            let size = UIScreen.main.bounds.size
            let height = max(size.width, size.height)
            
            switch height {
            case 568:
                return .iPhoneSE
            case 667:
                return .iPhone8
            case 736:
                return .iPhone8Plus
            case 812:
                return .iPhoneXS
            case 896:
                return .iPhoneXSMax
            default:
                return .unsupported
            }
        }
    }
    
    var modelName: String {
        var systemInfo = utsname()
        uname(&systemInfo)
        let machineMirror = Mirror(reflecting: systemInfo.machine)
        let identifier = machineMirror.children.reduce("") { identifier, element in
            guard let value = element.value as? Int8, value != 0 else {
                return identifier
            }
            return identifier + String(UnicodeScalar(UInt8(value)))
        }

        switch identifier {
        case "iPod5,1":
            return "iPod Touch 5"
        case "iPod7,1":
            return "iPod Touch 6"
        case "iPhone3,1", "iPhone3,2", "iPhone3,3":
            return "iPhone 4"
        case "iPhone4,1":
            return "iPhone 4s"
        case "iPhone5,1", "iPhone5,2":
            return "iPhone 5"
        case "iPhone5,3", "iPhone5,4":
            return "iPhone 5c"
        case "iPhone6,1", "iPhone6,2":
            return "iPhone 5s"
        case "iPhone7,2":
            return "iPhone 6"
        case "iPhone7,1":
            return "iPhone 6 Plus"
        case "iPhone8,1":
            return "iPhone 6s"
        case "iPhone8,2":
            return "iPhone 6s Plus"
        case "iPhone9,1", "iPhone9,3":
            return "iPhone 7"
        case "iPhone9,2", "iPhone9,4":
            return "iPhone 7 Plus"
        case "iPhone8,4":
            return "iPhone SE"
        case "iPhone10,1", "iPhone10,4":
            return "iPhone 8"
        case "iPhone10,2", "iPhone10,5":
            return "iPhone 8 Plus"
        case "iPhone10,3", "iPhone10,6":
            return "iPhone X"
        case "iPad2,1", "iPad2,2", "iPad2,3", "iPad2,4":
            return "iPad 2"
        case "iPad3,1", "iPad3,2", "iPad3,3":
            return "iPad 3"
        case "iPad3,4", "iPad3,5", "iPad3,6":
            return "iPad 4"
        case "iPad4,1", "iPad4,2", "iPad4,3":
            return "iPad Air"
        case "iPad5,3", "iPad5,4":
            return "iPad Air 2"
        case "iPad6,11", "iPad6,12":
            return "iPad 5"
        case "iPad7,5", "iPad7,6":
            return "iPad 6"
        case "iPad2,5", "iPad2,6", "iPad2,7":
            return "iPad Mini"
        case "iPad4,4", "iPad4,5", "iPad4,6":
            return "iPad Mini 2"
        case "iPad4,7", "iPad4,8", "iPad4,9":
            return "iPad Mini 3"
        case "iPad5,1", "iPad5,2":
            return "iPad Mini 4"
        case "iPad6,3", "iPad6,4":
            return "iPad Pro 9.7 Inch"
        case "iPad6,7", "iPad6,8":
            return "iPad Pro 12.9 Inch"
        case "iPad7,1", "iPad7,2":
            return "iPad Pro 12.9 Inch 2. Generation"
        case "iPad7,3", "iPad7,4":
            return "iPad Pro 10.5 Inch"
        case "AppleTV5,3":
            return "Apple TV"
        case "AppleTV6,2":
            return "Apple TV 4K"
        case "AudioAccessory1,1":
            return "HomePod"
        case "i386", "x86_64":
            return "Simulator"
        default:
            return String(format: "Unknown device: identifier %@", identifier)
        }
    }
}

public enum DeviceType {
    case iPhoneSE
    case iPhone8
    case iPhone8Plus
    case iPhoneXS
    case iPhoneXSMax
    case unsupported
    
    var isPhone: Bool {
        return supportedTypes.contains(self)
    }
    
    /// The `current` device type is at least equal to
    /// the provided version or newer.
    func isAtLeast(_ this: DeviceType) -> Bool {
        guard this.isPhone else { return false }
        guard let current = supportedTypes.firstIndex(of: self) else { return false }
        guard let minimumRequired = supportedTypes.firstIndex(of: this) else { return false }
        return current >= minimumRequired
    }
    
    /// The `current` device type is older than
    /// the provided version.
    func isBelow(_ this: DeviceType) -> Bool {
        guard this.isPhone else { return false }
        guard let current = supportedTypes.firstIndex(of: self) else { return false }
        guard let minimumRequired = supportedTypes.firstIndex(of: this) else { return false }
        return current < minimumRequired
    }
    
    /// The `current` device type is newer than
    /// the provided version.
    func isAbove(_ this: DeviceType) -> Bool {
        guard this.isPhone else { return false }
        guard let current = supportedTypes.firstIndex(of: self) else { return false }
        guard let excluded = supportedTypes.firstIndex(of: this) else { return false }
        return current > excluded
    }
    
    fileprivate var supportedTypes: [DeviceType] {
        return [.iPhoneSE,
                .iPhone8,
                .iPhone8Plus,
                .iPhoneXS,
                .iPhoneXSMax]
    }
}
